THE SHARING OF AN EDGE BETWEEN A URANYL PENTAGONAL BIPYRAMID AND SULFATE TETRAHEDRON IN THE STRUCTURE OF KNa5[(UO2)(SO4)4](H2O)
Bibliographic record
Abstract
The new uranyl sulfate compound KNa5[(UO2)(SO4)4](H2O) has been synthesized and its structure has been determined. It is monoclinic, space group C2/c, a 16.917(1), b 5.5999(5), c 35.340(3) Å, 90.437(2)°, V 3347.7(5) Å3, Z = 8. The structure has been solved and refined on the basis of F2 for all unique data collected with monochromatic MoK X-radiation and a CCD-based detector to an agreement factor R1 of 3.6%, calculated using 4981 unique observed reflections (Fo ≥ 4F). The structure contains an unusual uranyl sulfate cluster with composition [(UO2)(SO4)4]6–. The cluster is composed of a uranyl pentagonal bipyramid and four sulfate tetrahedra. Three sulfate tetrahedra are linked to the uranyl pentagonal bipyramid by the sharing of vertices, and the other shares an equatorial edge of the uranyl pentagonal bipyramid. The uranyl sulfate clusters are linked through bonds to K and Na cations, and by H bonding. The uranyl sulfate cluster, which was recently also found in two Na uranyl sulfates, is unusual in the sharing of an edge between a uranyl polyhedron and a M6+O4 tetrahedron.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".